Patent US4042022A successfully refreshed from Google Patents.
US4042022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Devices for centralizing pipes in borings
Assignee: GEM (K) Ltd DALLAS ROAD BEDFORD MK42 9EL ENGLAND A BRITISH Co
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Filing: 1975-10-06
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Granted: 1977-08-16
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Expires: 1995-10-06
Abstract
Abstract A centralizing device comprising a plurality of blades and a pair of substantially cylindrical collars adapted to receive and carry the blades. Each collar is formed with at least two parts detachably and/or pivotally connected to each other, and each collar carries inwardly extending deformable metal fixing projections. Each end of each blade is bent substantially at right angles to a portion of the blade adjacent the end. When the blades are fitted so as to lie internally of the collars, each bent end fits into a slot in one of the collars and the projections are deformed so as to lie on the sides of the blade portions remote from the collars to thus fix the portions to the collars.
Inventors
- 👤 Stephen Francis Edmund Wills
- 👤 Henry Edward Pledger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:24
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1014; E21B17/1021; E21B17/1028
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
154 words
A centralising device comprising: a. a plurality of blades each having a bent portion at both ends substantially at right angles to a portion of the blade adjacent the ends; b. a pair of substantially cylindrical collars adapted to receive and carry the blades and each having at least two parts detachably connected to each other and including a locating slot for receiving each blade end; c. pairs of deformable metal fixing projections carried one each of said collars and extending inwardly therefrom for securing each of said blades to said collars, whereby when the blades are fitted so as to lie internally of the collars, each bent end portion of said blades fits into one of said locating slots in each of said collars and said projections are deformed so as to lie on the face of said blade portions remote from the collars to thus fix said blade portions to said collars.
Claim 2
Dependent Claim
154 words
A centralising device comprising: a. a plurality of blades each having a bent portion at both ends substantially at right angles to a portion of the blade adjacent the ends; b. a pair of substantially cylindrical collars adapted to receive and carry the blades and each having at least two parts detachably connected to each other and including a locating slot for receiving each blade end; c. pairs of deformable metal fixing projections carried one each of said collars and extending inwardly therefrom for securing each of said blades to said collars, whereby when the blades are fitted so as to lie internally of the collars, each bent end portion of said blades fits into one of said locating slots in each of said collars and said projections are deformed so as to lie on the face of said blade portions remote from the collars to thus fix said blade portions to said collars.
Claim 3
Dependent Claim
24 words
A centralising device according to claim 1, wherein said fixing projections are formed by metal strips which pass through holes in the collar wall.
Claim 4
Dependent Claim
37 words
A centralising device according to claim 1, wherein said fixing projections are formed as part of the collar wall and which provide when deformed from the plane of the collar an additional slotted portion in said collar.
Claim 5
Dependent Claim
27 words
A centralising device according to claim 3, wherein said blades are provided with a U-shaped deformed portion which fits into the additional slotted portion in said collar.
Claim 6
Dependent Claim
38 words
A centralising device according to claim 1, wherein each collar comprises two half-rings pivotably connected by means of two hinges, each hinge including a removable pin to allow pivoting of said half-rings on the other of said hinges.
Claim 7
Dependent Claim
22 words
A centralising device according to claim 1, wherein a ring is provided on an internal face of said collars to strengthen them.
Claim 8
Dependent Claim
22 words
A centralising device according to claim 1, wherein arcuate blocks are provided on an internal face of said collars to strengthen them.
Claim 9
Dependent Claim
44 words
A centralising device according to claim 1, wherein an inwardly projecting U-shaped portion is provided close to the end of said blade but spaced from the bent over end, said inwardly projecting portion being engageable with a stop ring when located on a casing.
Claim 10
Dependent Claim
44 words
A centralising device according to claim 1, wherein each blade includes a bowed central portion positioned external to said collars when fitted thereto to provide resilient centralising for the device and each collar includes cut away portions to allow resilient movement of said blades.
References Cited (Backward Citations)
GB662551A
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US2680488A
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US3055432A
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US3356147A
Cited
GB1156710A
Cited
US3566965A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-15 | 1981-02-14 | 1981-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-15 | 1985-02-14 | 1985-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-15 | 1989-02-14 | 1989-08-16 | $7700.00 | Window Closed / Lapsed |